Enhancement of immunostimulatory properties of exosomal vaccines by incorporation of fusion-competent G protein of vesicular stomatitis virus

Vaccine. 2008 Jul 4;26(29-30):3662-72. doi: 10.1016/j.vaccine.2008.04.069. Epub 2008 May 16.

Abstract

Exosomes have been proposed as candidates for therapeutic immunization. The present study demonstrates that incorporation of the G protein of vesicular stomatitis virus (VSV-G) into exosome-like vesicles (ELVs) enhances their uptake and induces the maturation of dendritic cells. Targeting of VSV-G and ovalbumin as a model antigen to the same ELVs increased the cross-presentation of ovalbumin via an endosomal acidification mechanism. Immunization of mice with VSV-G and ovalbumin containing ELVs led to an increased IgG2a antibody response, expansion of antigen-specific CD8 T cells, strong in vivo CTL responses, and protection from challenge with ovalbumin expressing tumor cells. Thus, incorporation of VSV-G and targeting of antigens to ELVs are attractive strategies to improve exosomal vaccines.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibodies / blood
  • Antigen Presentation
  • CD8-Positive T-Lymphocytes / immunology
  • Cytotoxicity, Immunologic
  • Dendritic Cells / immunology*
  • Endosomes / metabolism
  • Humans
  • Membrane Glycoproteins / immunology*
  • Mice
  • Mice, Inbred C57BL
  • Neoplasms / prevention & control
  • Ovalbumin / immunology
  • Protein Transport
  • Secretory Vesicles / immunology*
  • Vaccines / immunology*
  • Viral Envelope Proteins / immunology*

Substances

  • Antibodies
  • G protein, vesicular stomatitis virus
  • Membrane Glycoproteins
  • Vaccines
  • Viral Envelope Proteins
  • Ovalbumin